I don't know the origin or anything, but could "Obiwa" be as mentioned in earlier chapers, O-(honorific)Biwa(loquat)?
Because I did find some loquat candy (nothing looking like it though, but then I definitely don't have the skills to look for japanese candy)
(First I though that the explicit mention of color shifting would mean the candy was named for biwa pearls, but apparently that name is later anyway)